Safety-valve



C. GRANBY.

SAFETY VALVE.

APPLICATION FILED 001.4.1919.

1,377,199. Patented May 10, 1921.

INVENTOR. Colm Granb A TTOR NE YJ UNITED S A E PATENT?OFFICE;

conm enAnBY, or o1=rIcAoo, -Intmois.

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Specification of Letters Patent.

Application filed October 1, 1919. .Serial No. 327,615.

To all whom it may concern:

Be it known that I, COLIN GRANBY, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Safety-Valves, of which the following is a specification.

stated in which the valve spring is completely protected against the corroding influence of the steam or other fluid pressure, and also to provide a muflier to deaden the noise made by the escaping fluid pressure. v

The object stated is attained by means of a combination and arrangement of parts to be hereinafter described and claimed, and in order that the same may be better understood, reference is had to the accompanying drawing forming a part of this specification.

In the drawing, a vertical section of the device is shown. 7

Referring specifically to the drawing, 5 denotes the base of the valve, the same havin a fluid pressure inlet 6 leading to a seat 7 or a win valve 8, and said seat having the usual ad usting ring 9. On the base 5 is screwed or otherwise fixed a chamber 10 having at the top a reduced portion 11 which houses the valve 'sprin 12. The chamber 10 also supports a mu er chamber 13 and opens into the latter. In the top of the valve 8 is a recess 14 inwhich seats loosely the inner end of astem 15 having a short distance above the valve a rounded shoulder 16 to support a holder or abutment 17 for one end of the spring 12. The other end of the spring abuts against a holder 18, and the latter, 1n turn,

is engaged by an adjusting screw 19 which is screwed into the top 20 of the spring chamber or housing 11. The stem 15 passes loosely through the holders 17 and 18, and the-screw 19, and the former has an internal rounded shoulder 21 seating on the shoulder 16. As the shoulders 16 and 21 are rounded off, a ball-and-socket or swivel connection between the stem 15 and the holder 16 is produced, which leaves the stem free to shift and thus remain properly centered irrespective of inequalities in the spring pressure tending to displace or derange the stem.

' The top of the valve 8' has a cylindrical extension 22 seating slidably in a cylindrical guide wall 23 at the bottom of the sprin chamber 11. The part 22 has an externa groove to seat a packing ring 24, whereby the chamber 11 is effectually sealed against the entrance of escaping steam or other fluid pressure when the valve 8 opens, and as the fluid pressure therefore cannot reach the spring, the latter is not exposed to the corroding influence thereof. The bottom of the abutment 17 seats. in and is guided by the part 22.

At its bottom, the mufiler chamber 13 seats on a'top shoulder 25 of the chamber 10, and at the top,-the mufller chamber has an opening to seat on an external shoulder 26 at the to' of the part 20. A nut 27 is screwed on the protruding end of the screw 19 and bears on the top of the mufller chamber 13 to hold the same in place. The muffler chamber 13 is entirely separate from the remainder of the device and hence it can be readily removed without disturbing the 1atter,.by simply taking ofi the screw 19.

The chamber 10 receives the steam or other fluid pressure escaping past the valve 8 when the latter opens, and from said chamber, the fluid pressure passes into the mufller chamber 13 and escapes therefrom through erforations 28 in the top thereof. The mu er chamber 13 surrounds the spring chamber 11 and has its lower open end seatin over the open top of the chamber 10.

11 order to increase theefficieney of the mufller chamber 13, the wall thereof is provided with alternately-arranged baflle plates or partitions, 29 to provide a tortuous path for the fluid pressure passing through said chamber. These partltions are connected by webs 30, and alternate partitions are integral with the wall of the muflier chamber. The mufller is therefore all in one piece and the complete unit can be readily removed as hereinbefore described.

I claim:

. In a pop safety valve, a base having a fluid pressure inlet and a fluid pressure Patented May 10, 1921.

escape chamber, a pop valve 7 mechanism controlling the escape of the fluid pressure from the inlet into the chamber, said mechanism including a valve and a spring for seating the same, a valve stem loosely engaging the valve, and abutments loose on the stem, between which abutments the spring is located, one of said abutments and the stem being swivelingly. connected, and the Valve having a guide chamber into which 10 said abutment extends.

In testimony whereof I affix'my signature.

COLIN GRANBY. 

